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diff --git a/llvm/lib/Target/WebAssembly/WebAssemblySubtarget.h b/llvm/lib/Target/WebAssembly/WebAssemblySubtarget.h
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index 000000000000..8db2120f9834
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+++ b/llvm/lib/Target/WebAssembly/WebAssemblySubtarget.h
@@ -0,0 +1,115 @@
+//=- WebAssemblySubtarget.h - Define Subtarget for the WebAssembly -*- C++ -*-//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file declares the WebAssembly-specific subclass of
+/// TargetSubtarget.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
+
+#include "WebAssemblyFrameLowering.h"
+#include "WebAssemblyISelLowering.h"
+#include "WebAssemblyInstrInfo.h"
+#include "WebAssemblySelectionDAGInfo.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include <string>
+
+#define GET_SUBTARGETINFO_ENUM
+#define GET_SUBTARGETINFO_HEADER
+#include "WebAssemblyGenSubtargetInfo.inc"
+
+namespace llvm {
+
+// Defined in WebAssemblyGenSubtargetInfo.inc.
+extern const SubtargetFeatureKV
+    WebAssemblyFeatureKV[WebAssembly::NumSubtargetFeatures];
+
+class WebAssemblySubtarget final : public WebAssemblyGenSubtargetInfo {
+  enum SIMDEnum {
+    NoSIMD,
+    SIMD128,
+    UnimplementedSIMD128,
+  } SIMDLevel = NoSIMD;
+
+  bool HasAtomics = false;
+  bool HasNontrappingFPToInt = false;
+  bool HasSignExt = false;
+  bool HasExceptionHandling = false;
+  bool HasBulkMemory = false;
+  bool HasMultivalue = false;
+  bool HasMutableGlobals = false;
+  bool HasTailCall = false;
+
+  /// String name of used CPU.
+  std::string CPUString;
+
+  /// What processor and OS we're targeting.
+  Triple TargetTriple;
+
+  WebAssemblyFrameLowering FrameLowering;
+  WebAssemblyInstrInfo InstrInfo;
+  WebAssemblySelectionDAGInfo TSInfo;
+  WebAssemblyTargetLowering TLInfo;
+
+  /// Initializes using CPUString and the passed in feature string so that we
+  /// can use initializer lists for subtarget initialization.
+  WebAssemblySubtarget &initializeSubtargetDependencies(StringRef FS);
+
+public:
+  /// This constructor initializes the data members to match that
+  /// of the specified triple.
+  WebAssemblySubtarget(const Triple &TT, const std::string &CPU,
+                       const std::string &FS, const TargetMachine &TM);
+
+  const WebAssemblySelectionDAGInfo *getSelectionDAGInfo() const override {
+    return &TSInfo;
+  }
+  const WebAssemblyFrameLowering *getFrameLowering() const override {
+    return &FrameLowering;
+  }
+  const WebAssemblyTargetLowering *getTargetLowering() const override {
+    return &TLInfo;
+  }
+  const WebAssemblyInstrInfo *getInstrInfo() const override {
+    return &InstrInfo;
+  }
+  const WebAssemblyRegisterInfo *getRegisterInfo() const override {
+    return &getInstrInfo()->getRegisterInfo();
+  }
+  const Triple &getTargetTriple() const { return TargetTriple; }
+  bool enableAtomicExpand() const override;
+  bool enableIndirectBrExpand() const override { return true; }
+  bool enableMachineScheduler() const override;
+  bool useAA() const override;
+
+  // Predicates used by WebAssemblyInstrInfo.td.
+  bool hasAddr64() const { return TargetTriple.isArch64Bit(); }
+  bool hasSIMD128() const { return SIMDLevel >= SIMD128; }
+  bool hasUnimplementedSIMD128() const {
+    return SIMDLevel >= UnimplementedSIMD128;
+  }
+  bool hasAtomics() const { return HasAtomics; }
+  bool hasNontrappingFPToInt() const { return HasNontrappingFPToInt; }
+  bool hasSignExt() const { return HasSignExt; }
+  bool hasExceptionHandling() const { return HasExceptionHandling; }
+  bool hasBulkMemory() const { return HasBulkMemory; }
+  bool hasMultivalue() const { return HasMultivalue; }
+  bool hasMutableGlobals() const { return HasMutableGlobals; }
+  bool hasTailCall() const { return HasTailCall; }
+
+  /// Parses features string setting specified subtarget options. Definition of
+  /// function is auto generated by tblgen.
+  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
+};
+
+} // end namespace llvm
+
+#endif